A cable bus system for the mounting and positioning of high amperature, from low to high voltage electrical power cables transmitting polyphase electrical current. The cable bus system included a ventilated enclosure used to protect electrical cables mounted therein. The enclosure is provided with multiple modular cable trays which are bolted together in a stacked arrangement to form a single multi-level cable raceway. The enclosure is further provided with ventilated top and bottom covers which are secured respectively to the top and bottom of the uppermost and bottom most cable trays to define the enclosed metal circuit. The cable bus system is capable of transmitting the same highest allowable “free air” cable amperature in both above and underground installations, effectively improving the transmission of electrical power from one end to the other end, in installations where a transition of electrical power from below ground to above ground is either necessary or economically preferable. For the underground portion, the cable bus is installed in the encasement that is uniquely offset vented or power cooled to meet the cable high amperage requirements. The cable bus system is also suitable for high vertical rise installations when utilizing anti cable slip mechanism or technique.
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13. A high amperage power distribution system comprising:
a below-ground cable enclosure having a top, a bottom and sidewalls defining a longitudinally extending enclosure cavity, and
a longitudinally extending cable raceway section disposed in said enclosure cavity, the raceway section, including:
a plurality of longitudinally extending cable trays, each cable tray including an associated pair of generally parallel longitudinally extending side members, a plurality of laterally extending cross supports spanning between and coupled relative to each said side member and defining a cable support surface,
the cable trays being positioned in a generally stacked orientation with the side members of a first said cable tray being secured in substantially aligned juxtaposition with the side members of a next lower cable tray,
a plurality of electrical cable arrays selected for the distribution of high amperature polyphase electrical current disposed in an interior of said raceway, each cable array being associated with a respective one of said cable trays and comprising a plurality of generally parallel spaced electrical cables selected to conduct high amperature, polyphase electrical current disposed in supporting contact with the cable support surfaces of the associated said cable tray,
a plurality of clamping members substantially securing said electrical cables of each cable array against movement relative to the cross supports of the associated cable tray,
a ventilation assembly including an air vent shaft providing fluid communication between an exterior and an interior of the enclosure cavity,
the cable enclosure and cable raceway section being selected to allow for longitudinal airflow along the interior of the enclosure cavity and into and/or from the air vent shaft.
1. A subterranean power distribution system, including:
a cable bus system comprising:
a longitudinally extending raceway comprising:
at least two levels of longitudinally extending cable trays, each cable tray including:
a pair of generally parallel longitudinally extending side beams, and
a plurality of laterally extending cross supports, the cross supports spanning between each said side beam and defining a cable support surface,
at least one electrical cable array disposed in an interior of said raceway and associated with a corresponding one of said cable trays, each said cable array comprising a plurality of insulated high amperature electrical cables disposed in a generally longitudinally parallel spaced operable position in supporting contact against the upper support surfaces of the cross supports of the associated said cable tray,
at least one clamping member for securing associated said cables to an associated cross support substantially against movement from said operable position in said raceway; and
a below ground cable bus enclosure, the cable bus enclosure having a top, a bottom and opposing sidewalls defining a longitudinally extending enclosure cavity sized to receive the raceway therein whilst allowing substantially free air flow longitudinally relative to said raceway, a ventilation assembly for facilitating air flow into or from said enclosure cavity, said ventilation assembly including,
an air vent shaft extending generally vertically from a lower end to an upper end portion, the air vent shaft further comprising at least one opening fluidically communicating with said enclosure cavity and permitting air flow from said enclosure cavity into said air vent shaft,
the raceway being at least partially supported by the enclosure bottom and disposed at least partially within and extending along a length of said enclosure cavity.
2. The power distribution system of
3. The power distribution system of
4. The power distribution system of
5. The power distribution system of
6. The power distribution system of
7. The power distribution system of
8. The power distribution system of
9. The power distribution system of
10. The power distribution system of
11. The power distribution system as claimed in
a fan unit operable to induce air flow from said air source into the enclosure cavity via the vent opening, and
a thermostatic control operable to activate said fan unit when a temperature in the enclosure cavity exceeds a predetermined threshold temperature.
12. The power distribution as claimed in
14. The power distribution system of
15. The power distribution system of
16. The power distribution system as claimed in
17. The power distribution system of
18. The power distribution system as claimed in
a fan unit operable to induce air flow into or from said vent opening, and
a thermostatic control operable to activate said fan unit when a temperature in the enclosure cavity exceeds a predetermined threshold temperature.
19. The power distribution system as claimed in
20. The power distribution system as claimed in
a fan unit operable to induce air flow from said air source into the enclosure cavity via the vent opening, and
a thermostatic control operable to activate said fan unit when a temperature in the cavity exceeds a predetermined threshold temperature.
21. A power distribution system as claimed in
said clamping members are configured to secure said cables while allowing longitudinal airflow therepast along an interior of said raceway section, and
said air vent shaft extends generally vertically from a lower end to an upper end portion in fluid communication with the atmosphere, the air vent shaft comprises an offset side aperture open to the enclosure cavity spaced vertically a distance above the lower end of the shaft, the upper end portion extending to a surface grate or periscope-type air vent, and wherein the lower end portion of the air vent shaft configured to allow drainage of water therefrom.
22. The power distribution system of
23. The power distribution system of
24. The power distribution system of
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This application is a continuation of U.S. patent application Ser. No. 14/700,374, filed 30 Apr. 2015 which is a continuation of U.S. patent application Ser. No. 14/026,758, filed 13 Sep. 2013, now U.S. Pat. No. 9,059,575 B2 and which is a continuation-in-part of U.S. patent application Ser. No. 12/929,671, filed 8 Feb. 2011, now U.S. Pat. No. 8,558,112 B2.
The present invention relates to a cable bus system for use in the distribution of electric power, and more particularly an expandable cable bus system for the distribution and/or transmission of low, medium and high voltage, high amperage, polyphase alternating-current having amperatures ranging up to 8,000 Amps, and/or at voltages of up to 230,000 volts.
In power generation and transmission, electrical generator coils or windings are used to produce alternating electric current. To effect the more economical transmission of produced electric current, polyphase transmission systems have been developed. Conventionally, most polyphase power transmission is effected in the form of three-phase power transmission where three alternating currents are produced. Three-phase electrical transmission systems are typically based on a three conductor construction, each conductor used to transfer individual alternating currents which are produced. The alternating currents are generated to reach respective instantaneous peak values at different times, with the second and third currents being delayed respectively by one-third and two-thirds of the current cycle time.
In electrical distribution equipment used to transmit high amperature electrical power from the grid to a load area, the generated polyphase power is supplied by way of electrically insulated stranded conductors or cables when installed near electrical grounds. As the amperature electric current to be delivered increases to higher values, the three conductor constructions become less economical and feasible to use due to the damaging mutual heating of the conductor insulation. Therefore, multiple single conductor cables spaced and strategically positioned apart, are provided for each separate phase as a means to effect equal current sharing, and prevent current varying along any one cable which could otherwise result in overheating. Where such multiple cable delivery systems are provided, it is necessary that the cables are arranged in a parallel format for each phase in a well spaced and oriented manner to avoid electrical current, as well as magnetic field imbalance. The specific cable spacing and orientation varies on an installation-by-installation basis, depending on a number of limitations on current carrying factors, such as the current amperature, cable size, as well as thickness and/or quality of cable conductor insulation.
In an effort to ensure optimal electrical power cable spacing and orientation, various cable bus systems have been developed to provide both mechanical protection and ensure the desired positioning of electrical cables. A prior art cable bus system 6 of the type sold under the name Superior Cable Bus™ by Superior Tray Inc. of British Columbia, Canada and MP Husky™ Cable Bus by MP Husky in Greenville, S.C., are shown in
Along each side of the raceway 22 opposing pairs of C-shaped rails 23 are provided at three foot intervals for each receiving and retaining therein in a series of split blocks 24 which must be locked together using bolts on each side. The split blocks 24 are used to secure the cables 12 in place within the raceway 22, in a sandwiched arrangement. Each split block 24 is formed as a series of chocks 26a,26b,26c which are approximately one inch in thickness. The chocks 26 are provided with a series of pre-drilled holes 28 which are centered along their abutting edges. The holes 28 are sized to receive respective cables 12 therein. The holes 28 are spaced and positioned across the block 24 at multiple levels to receive and support a number of electric cables 12 in a parallel relationship therein.
The applicant has appreciated that various limitations exist with prior art split block cable bus systems 6. In particular, the use of split chocks 26a,26b,26c to support and position electrical cables 12 are both cumbersome and time consuming. In certain cases physical space constraints may prevent the installation of bolts necessary to lock the blocks together. Because it is not technically allowable or feasible to splice the parallel cables in each polyphase used in high amperature cable transmissions systems, it is necessary to physically draw full circuit lengths of cable in each layer of the electrical cables 12 successively over each chock 26a,26b at the site of installation. Because of the longitudinal length spacing between the sets of split blocks and the varying surface contour of each split block 24, this in turn necessitates the use of labour intensive cable rollers to avoid cable damage, increasing both the time and cost of installation.
In addition, if the outside diameter of the cable insulation layer 13 varies relative to the diameter of preformed holes 28 as a result of manufacturing tolerances, the holes 28 formed in the cable support blocks 24 could be either too loose or too tight for proper cable mounting. The correction of hole sizes is both difficult and costly, if deemed possible, and therefore requires the manufacturing and replacement of the split blocks.
Another disadvantage is that the cables used are normally heavier, larger sized conductors with relatively thin insulation which can be readily ruptured and fail at the three foot interval support locations, as a result of commonly occurring and damaging electrical system fault forces.
Further, the positioning of split blocks 24 at approximate three foot intervals results in the formation of sectionalized compartments along the length of the raceway 22. If ventilation openings in the top panel 18 are inadvertently covered by debris or the like, this disadvantageously may result in localized cable hot spots along the raceway 22 as a result of blockage of required airflow.
More problematic however, if cables 12 at a lower level require removal or replacement as a result of damage or failure, with prior art systems it is necessary to first completely remove and thereafter reinstall all overlying chock blocks 26c,26d and the upper cable layers from the raceway 22 at significantly increased time, cost and difficulty.
Another disadvantage of the prior art of cable bus systems are typically installed above ground level in order to ensure that free flowing air passing through the vented covers dissipates undesirable heat generated by cables away from the enclosure. Heat trapped within the vicinity of the high amperage cables will cause the ambient temperature to rise, causing premature failure of the cable installation or necessitating the substantial derating of the allowable cable amperature, which can become cost prohibitive.
Power cables of varying levels of amperage are commonly installed underground by either underground conduits encased within poured concrete, or alternately directly buried. Due to the slow rates of heat transfer away from the heat generating cables due to a lack of airflow, the amperage of cables installed in such mediums are restricted both technically and by industry standards to approximately one half of that allowable for cables which are continuously cooled by air movement. When a power cable circuit is conventionally installed partially underground with the balance of the circuit installed where there is open airflow, the allowable amperage for the cables in the total circuit length is restricted to the lower underground amperage values resulting in uneconomical installation practices.
The present invention provides a cable bus system for the mounting and positioning of electrical power cables used to conduct high amperature, polyphase electrical current up to 8,000 Amps. The cable bus system is configured to ensure that electrical impedance along each parallel conductor cable is identical to provide equal current load sharing, while minimizing phase impedance and the generation of cable mutual heating thereby. In the cable bus system, a predetermined number of electrical cables are fixed in position relative to each other to minimize the possibility of excessive heating of cable conductor insulation as a result of the heat generated by the transmission of electricity therealong.
A further object of this invention is to prove an underground cable bus system meets free or forced flowing air requirements necessary to maintain cooling of the power cables and thereby attain the maximum cable amperage throughout the circuit route.
Another object is to provide a subterranean cable transmission assembly in which a cable bus enclosure is provided in an underground encasement composed of concrete or other suitable material, and which is air vented in an offset manner that prevents entry of debris and soil materials into the enclosure at preselected locations along the encasement circuit length.
Another object of the present invention is to provide a cable bus system for use in the orientation of electrical power cables, and which allows for the simplified addition and/or removal of electrical cables as power supply and/or load requirements may change.
Another object of the invention is to provide a cable bus system enclosure for insulated electrical cables used in the transportation and/or transmission of high amperature electrical power, and preferably electrical power at amperatures of up to 8,000 Amps from a source to a load area, and which is constructed to provide for enhanced uninterrupted airflow longitudinally along the enclosure.
Another object of the invention is the use of high temperature power cables in the present invention to achieve a compact, highly efficient power feeder system for critical circuits required to remain in operating condition without failure during emergency fire situations.
Another object of the invention is to provide a cable bus system which incorporates one or more stackable modular metal cable trays for use in the assembly of a multi-layer metal cable enclosure used in the erection of a cable bus or raceway, and which are configured to support a number of electrical power cables at multiple spaced layers, while minimizing electrical impedance, maximizing ventilation of heat generated by current carrying cables and achieving the highest industry allowable free air power cable enable amperage.
A further object of the invention is to provide a cable bus system which is adapted to support electrical cables with minimized risk of cable insulation damage as a result of mechanical stresses at cable/support system contact points.
Another object of the invention is to provide auxiliary anti-slip gripping sleeve or grommet for positioning over the cable outer cover at strategically located cable clamp location in vertical cable bus installations. Although the cables in vertical arrays are usually clamped approximately every two to three feet in vertical installations, there is a high risk of cable slipperage particularly in vertical heights greater than approximate 30 feet due to downward forces exerted by gravitational weight during cable vibration or electrical fault forces. Typically the gripping sleeves are formed of an elastomeric or resiliently compressible material such as rubber Neoprene™ or plastic. Anti-slip gripping sleeves may advantageously serve as both a non-slip connection between the cable, clamp and enclosure cross-brace members and serve to additionally insulate the electrical cable from metallic cable bus support components.
To at least partially achieve some of the aforementioned objects, the present invention provides a cable bus system which includes a ventilated enclosure suitable for use in the protection of unarmoured or armoured electrical cables mounted therein. Although not essential, the enclosure is most preferably provided with a modular design and consisting of one or more multiple single level cable trays which maybe bolted in a stacked arrangement in the formation of a single or multi-level cable raceway. In such an embodiment, the addition or removal of individual cable trays may thus be used in the erection of a larger or smaller capacity cable bus system depending on the power distribution requirements. Further, the use of modular cable trays allows existing cable bus systems to be upgraded in future with ease, allowing the addition of more cables as consumption requirements at a load and/or site may change.
The cable bus system is typically provided with ventilated top and bottom covers which are screwed, bolted or welded respectively to the top and bottom of the uppermost and bottommost cable trays to define the enclosed metal circuit.
In a simplified construction, each metal cable tray includes a pair of longitudinally extending vertical side panels, which are joined in a fixed orientation by a series of transversely extending connecting runs or cross-brace members. The connecting runs are screwed, welded or bolted at each end to a respective side panel and serve as both cross-brace members and a lower support for an associated array of electrical cables resting thereon. In optimum construction, the cross-brace members are provided with a generally flat and smooth uppermost surface which is selected to allow the cables of each associated array to be drawn longitudinally thereacross and along the raceway during straight cable pulling operations, without the requirement of cable support rollers.
One or more clamp members are provided to secure the cables of each array to an upper face of the associated cross-brace member. In one simplified construction, the clamp members may consist of an elongated metal bar which is provided with a series of spaced keepers which are configured for fitted placement over the upper peripheral portion of cables. The clamp members may be secured in a variety of manner, but most preferably are fixed in place by way of screws or bolts, which allows for later removal in the event cable repair and/or replacement may be required in future.
Most preferably, the cross-brace members of each cable tray are longitudinally off-set relative to the cross-brace members of a next, and more preferably each remaining modular tray in the cable bus system. It is to be appreciated that such an offset configuration allows vertical access to each cable array from a topside of the raceway without requiring the complete disassembly of the cable bus system.
Accordingly, in one aspect the present invention resides in a cable bus system comprising: a longitudinally extending raceway comprising, at least two levels of longitudinally extending cable trays, each cable tray including: a pair of generally parallel longitudinally extending side beams, and a plurality of laterally extending cross supports, the cross supports spanning between and being coupled to each said side beam and defining a cable support surface, said cross supports comprising a generally planar upper support surface selected to allow the electrical cables to be drawn thereacross without substantial damage to cable insulation, a bottom cover secured to a lowermost one of said cable trays, at least one electrical cable array disposed in an interior of said raceway and associated with a corresponding one of said cable trays, each said cable array comprising a plurality of insulated high amperature electrical cables disposed in a generally parallel spaced operable position in supporting contact against the upper support surfaces of the cross supports of the associated said cable tray, at least one clamping member for securing said cables substantially against movement from said operable position in said raceway, whilst allowing air flow longitudinally therebetween.
In another aspect the present invention resides in a high amperage electric cable bus system comprising: a longitudinally extending raceway comprising, a plurality of longitudinally extending cable trays, each cable tray having a generally modular construction and including an associated pair of generally parallel longitudinally extending side members, and a plurality of laterally extending cross supports, the cross supports spanning between and fixedly coupled to each said side member, and having a generally planar support surface, the cable trays being positioned in a generally stacked orientation with the side member of an a first said cable tray being secured in substantially aligned juxtaposition with the side members of a next lower cable tray, a plurality of electrical cable arrays selected for the distribution of high amperature polyphase electrical current disposed in an interior of said raceway, each cable array being associated with a respective one of said cable trays and comprising a plurality of generally parallel spaced electrical cables disposed in supporting contact with the support surfaces of the cross supports of the associated said cable tray, clamping members for securing said electrical cables of each cable array against movement relative to the cross supports of the associated cable tray, the clamping members being configured to permit longitudinal air flow along said raceway past said cross supports.
In a further aspect, the present invention resides in a longitudinally extending cable raceway section for use in a cable bus system, the raceway section including: a plurality of longitudinally extending cable trays, each cable tray including an associated opposing pair of longitudinally extending side members, and a plurality of laterally extending cross-brace members, the cross-brace members each defining a generally flat cable-support surface and spanning between and being fixedly coupled to each said side member, a bottom panel secured to a lowermost one of said cable trays and extending laterally substantially between each said side member to define a lower extent of the raceway section, a plurality of electrical cable arrays disposed in an interior of said raceway, each said cable array associated with a respective one of said cable trays and comprising a plurality of generally parallel spaced electrical cables mounted in supporting contact with support surface of the cross supports of the associated said cable tray, a plurality of clamping members for coupling said cables to the support surface of the cross supports and substantially against movement in said raceway while allowing longitudinal airflow along said raceway therepast.
Reference may now be had to the following detailed description taken together with the accompany drawings, in which:
Reference is made to
Each of the cable trays 32a,32b are normally formed from aluminum, or other suitable metal materials and are provided with a modular construction which allows for their use interchangeably. As shown best in
As shown best in
In a simplified construction, the bottom cover 34 is normally formed as having a predetermined number of openings serving as vents to allow the heat produced by the cables 12 to flow out of the enclosure. The ventilated cover 34 has a lateral width which could be selected marginally less than the lateral distance separating the webs 42,42′ of each side member 38a,38b. The bottom panel 34 may be screwed, bolted or riveted to the sidewall member flanges 44a,44b′ in place, or in an alternate configuration secured in position by weldments.
The cross-brace members 40 function as a support base for the electric power cables 12 in the assembly of the cable bus system 10. The cross-brace members 40a,40b,40c are most preferably formed as upwardly open square C-shaped channels, with the top surface 46 of each cross-brace member 40 presenting a substantially smooth, burr-free horizontal surface. The applicant has appreciated that in ensuring the top surface 46 is provided without barbs, sharp projections, or other roughened features, allows the electrical cables 12 to be pulled longitudinally through the enclosure 14 while resting directly on the cross-brace members 40a,40b,40c, without concern of damage to the cable insulating layer 13. In addition, the uninterrupted length of the raceway 22 advantageously provides enhanced longitudinal airflow along the raceway 22 itself, minimize the potential for local hot spots.
References made to
Following initial positioning of the first cable array 30a, the cables 12 are secured in place relative to the cable tray 32b by the use of series of one piece clamping bars 50. As shown in
Although not essential, most preferably, the clamping bars 50 is asymmetrically formed. In this construction, the clamping bars 50 extend from a first end 60a to a second end 60b with a first keeper pocket 58a spaced by a distance Dx from the end 60a, and the second other endmost keeper pocket 58b spaced from the second end 60b by a distance Dy. The applicant has appreciated that by selecting the distance Dy at approximately half that of Dx, the clamping bars 50 may advantageously be used to orient the cables 12 of cable array 30a,30b in the desired laterally offset orientation relative to each other simply by reversing the orientation of the cable bars 50 when securing each successive cable array 30a,30b for each adjacent level in the raceway 22. By providing one end 60a of the clamping bar 50 with an extension longer that the other end 60b in an ideal triangular electrical place conductor configuration may be achieved by reversing the clamping bars 50 on each adjacent level. Cable electrical impedance may thus be reduced, lowering system power losses.
In this simplified construction, a series of boreholes 62 are formed adjacent each end of the clamping bars 50. The boreholes 62 are sized to receive therein screw fasteners 66 in the securement of each clamping bar 50 to selected cross-brace member 40a,40c with the cables 12 of the cable array 30a sandwiched in a friction fit therebetween. Most preferably, the screw fasteners comprise spring loaded bolts which engage hand tightenable wing wiring nuts to eliminate the need of a difficult to use power tools.
Preferably, following the securement of the cables 12 of the cable array 30a in the lower tray 32a, the upper cable tray 32b is positioned. The upper cable tray 32b is stacked on top of, and secured to the lower cable tray 32b to provide the enclosure with multiple levels (
Following the securement or the cable tray 32b, the electrical cables 12 of the upper cable array 30b are then drawn through the raceway 22 positioned and clamped to the cross-brace members 40a,40c of the upper cable tray 32b, by the use of clamping bars 50 which are oriented in the reverse and staggered manner from those used to secure the lower cable array 30a.
In the present invention, the length of the clamping bars 50 is further selected to advantageously act as a spacer to maintain the cables 12 a preferred spacing from the sidewalls webs 42,42′ and from each other.
In the preferred construction shown, the top cover 36 is secured to the top flanges 44a,44a′ of the topmost cable tray 32b by way of screws or other fasteners allowing for future easy removal.
Following the securement of the upper cable array 30b, the cover panels 88,90 are screwed or bolted to the upper flanges 44a,44a′ of the upper cable tray 32b to complete the metal enclosure 14.
Although the detailed description describes the use of a clamping bar 50 to secure electrical cables 12 against movement, the invention is not so limited. It is to be appreciated that other clamping arrangements including, without restriction, the use of individual cable clamps may also be used, and will now become apparent.
It is to be appreciated that with the modular construction of the cable trays 32a,32b, if power delivery requirements increase in future, the cable bus system 10 may be easily expanded. For example, to increase electrical transmission capacity, the top cover 36 is removed, and a third level or more cable trays 32 used to secure additional cable arrays may easily be secured over the upper cable tray 32b in the same manner as its attachment to cable tray 32a. Following installation of the desired number of additional cable trays, the top cover 36 is reinstalled.
In addition, the present invention advantageously allows for the simplified servicing and replacement of one or more electrical cables 12. In the event cable replacement is required, the top cover 36 is removed. Because the cross-brace members 44a,44b,44c of the lower cable tray 32a are non-aligned with those of the upper cable tray 32a, it is possible to directly access and remove the clamping bars 50 used to secure the lower cable array 30a in place without requiring disassembly and/or removal of the cable array 30b.
Although the detailed description describes the cable bus system 10 as including a pair of cable arrays 30a,30b, which each include six electrical cables 12, the invention is not so limited. It is to be appreciated that the present invention is equally suited for use in the mounting of fewer or greater numbers of cable arrays 30, having fewer or greater numbers of individual electrical cables 12. Reference may now be had to
In
Optionally the enclosure 14 may be provided with a number of electrical receptors, neutral conductors (N) or null spacing or voids which, for example, allow the future expansion of the cable bus system 10 to include additional power cables, in each array 30a,30b,30c should electric transmission or distribution demands increase. It is to be appreciated that in assembly neutral conductors (N) will vary, depending on type of electrical system that is being corrected.
While the detailed description describes and illustrates the cable tray 32b as being positioned vertically on top of the cable tray 32a, the invention is not so limited. It is to be appreciated that although illustrated in a horizontal orientation, the metal enclosure 14 could also be mounted vertically and/or in an inclined position depending on the site of installation and the intended direction of the electrical raceway 22.
Reference is now made to
As shown best in
As shown in
It is be to appreciate that the subterranean power distribution system 300 shown in
Although
Reference may be had to
Although
It is to be appreciated that the cable bus system 10 of the present invention advantageously is adapted for installation in both above and underground applications. By way of non-limiting example, as shown in
Although the detailed description describes the clamping bar 50 and the enclosure 14 is made of aluminum, the invention is not so limited. Both the clamping bar 50 and/or enclosure 14 could be made of a variety of materials including other types of metals, cellulose based materials, wood, as well as plastics and polycarbonate-based compounds.
Reference may be had to
In
Reference may be had to
In addition to the subterranean vault or enclosure 100, the cable bus system 10 extends vertically above grade to the height of a desired target building floor 190. As shown best in
As shown best in
Reference may be had to
It is to be appreciated that the shaft 226 is configured for threaded engagement by the wing nut 224.
As shown in the exploded view, the seating plate 228 preferably includes a pair of locating guide grooves 230a,230b which are spaced for engagement with the sides of the cross-brace member 40 which define the open channel 24a therein. The plate 228 is provided with a dimension selected to allow its insertion into the channel 24a in a first orientation, while preventing its removal therefrom when rotated to align the grooves 230a,230b transversely relative thereto. The spring 240 has a length selected to resiliently bias the seating plate 228 into engaging contact with the underside of the channel top surface 46 to assist in maintaining desired positioning as the wing nut 224 is tightened along the shaft 226.
While the preferred embodiments disclosure the use of the cable bus system 10 as used in the transmission and distribution of three-phase high amperature electric power, it is to be appreciated that the invention is equally suited for other polyphase or mono-phase power distribution and/or transmission, depending on load and power generation requirements.
Although the detailed description describes and illustrates various preferred aspects, the invention is not so limited. Many modifications and variations will now occur to persons skilled in the art. For definition of the invention, reference may be had to the appended claims.
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